Topanga Lawrence Matthews
The daughter of two grown up hippies, Topanga began as an odd girl in the same class as Cory, Shawn and Minkus. However, by the time they reached High School, she had become much more of an average teenager. In Season 3, she began dating Cory, a relationship which lasted for the rest of the show. Topanga was initially a guest character with a hippie, eccentric personality, concerned about the world and harmony. In the later seasons, she became one of the show's main characters, transforming from a strange girl into an intellectual overachiever. Throughout the series, Topanga has always expressed her love for Cory, Shawn, and the rest of her friends.
Credit: Wikia